Microwave Frequency Bands
The microwave spectrum is usually defined as electromagnetic energy ranging from approximately 1 GHz to 100 GHz in frequency, but older usage includes lower frequencies. Most common applications are within the 1 to 40 GHz range. One set of microwave frequency bands designations by the Radio Society of Great Britain (RSGB), is tabulated below:
|
Letter Designation | Frequency range |
---|---|
L band | 1 to 2 GHz |
S band | 2 to 4 GHz |
C band | 4 to 8 GHz |
X band | 8 to 12 GHz |
Ku band | 12 to 18 GHz |
K band | 18 to 26.5 GHz |
Ka band | 26.5 to 40 GHz |
Q band | 33 to 50 GHz |
U band | 40 to 60 GHz |
V band | 50 to 75 GHz |
E band | 60 to 90 GHz |
W band | 75 to 110 GHz |
F band | 90 to 140 GHz |
D band | 110 to 170 GHz |
P band is sometimes used for Ku Band. "P" for "previous" was a radar band used in the UK ranging from 250 to 500 MHz and now obsolete per IEEE Std 521, see and.
When radars were first developed at K band during World War II, it was not realized that there was a nearby absorption band (due to water vapor and oxygen at the atmosphere). To avoid this problem, the original K band was split into a lower band, Ku, and upper band, Ka see.
Read more about this topic: Microwave
Famous quotes containing the words microwave, frequency and/or bands:
“The New Age? Its just the old age stuck in a microwave oven for fifteen seconds.”
—James Randi (b. 1928)
“One is apt to be discouraged by the frequency with which Mr. Hardy has persuaded himself that a macabre subject is a poem in itself; that, if there be enough of death and the tomb in ones theme, it needs no translation into art, the bold statement of it being sufficient.”
—Rebecca West (18921983)
“While they were there, the time came for her to deliver her child. And she gave birth to her firstborn son and wrapped him in bands of cloth, and laid him in a manger, because there was no place for them in the inn.”
—Bible: New Testament, Luke 2:6,7.